Does anyone have a program that calculates how much hp it would take to get a '71 Riv GS w/ a 3:42 posi, 4300-4400lbs.,230lb driver. down the quarter in low 13's or high 12's. I am looking for an honest idea of what it would take to outrun most stock Mustangs and Camaros. Or does anyone have a Boattail that runs at least 100mph in the quarter. Thank you...Soren
Using several online HP calculators, with a weight of 4550 lbs. and an ET of 12.9, it would require @425 rear wheel HP, or @500 flywheel HP to get that tank moving into the 12's.
While we're on the subject is ther a program or formula to estimate HP & Torque of a given BBB buildup?
Hey Phil, just out of curiousity..........on that same car...........assuming 220 HP at the rear wheels what would the 1/4 mile time come out to be on that calculator? :Brow:
Phillip, Thank you for the info...that certainly would require a stout motor; but it is do able....Soren
No problem, just shed about 1000 lbs......or get a 100 HP nitrous shot. They make a sneaky pete system that slips right over a carb stud and is totally hidden.
70 gsconvt, What info would you need for the Desktop Dyno calculations? Here is what I know of my engine 455 bored 30 over = 462cid 10.5:1 pistons (notched) 71cc iron heads with standard valves (lightly milled to clean up surface) GS113 cam S-Divider intake (port matched) 1" milled from divider Q-Jet (jetting unknown) Told it was set up for this engine cast iron exhaust manifolds 2 1/4" Dual exhaust with super Turbo mufflers Th400 trans with HD rebuild & shift kit 2800 stall converter 3.55 posi rear gear If you need anything more specific let me know. Thanks
OK, assuming your compression ratio is a true 10.5 to 1, your combo comes out to 348 HP at 5000 rpm's and 413 TQ at 4000 rpm. Bear in mind that Desktop dyno is NOT Buick head user friendly. Without flow numbers on the heads, I just used the "Wedge head with stock valves and light porting" value. Because you milled down the divider, you are essentially creating a single plane at the top end, and HP climbs to 367 at 5000 rpm. And remember the old 350 HP ratings from 1970 are the old gross ratings of the engine and absolutely nothing else, not even a water pump if I remember right.
Looking at the numbers that the program comes up with makes me think that I would have been better off keeping my bone stock 69' 400cid engine since it had close to the same #'s o No: All the effort and $$$ to build and install this new engine were wasted :ball: ou: :spank: I guess Poston's claim of 40 Hp from the cam are BS I may have to look at upgrading my 69' heads to stage1 specs and do some porting to them. What would a set of headers do for the combo? Different carb,intake ?
Changing to Stage 1 valves and porting with a single plane intake takes it to 410 HP at 5500 rpmand 430 TQ at 4500 rpm.
http://www.campbellenterprises.com/Race math calculators.htm This is where I go for this stuff. Keep in mind this is an estimate. Some maybe more or less. My buddy has a 1900 lbs camero that runs 4.70's in the eight mile and his is way off. He is making a lot less HP then what HP calculator says he needs to make. Here is also some more info: Speed is for quarter mile only. Speed 1/4 ET 1/8 ET Optimum 60 foot 109.5 12.00 7.64 1.61 112.2 11.75 7.47 1.58 115 11.50 7.30 1.55 118 11.25 7.14 1.52 121 11.00 6.98 1.49 123.5 10.75 6.81 1.46 126 10.50 6.65 1.43 130.2 10.25 6.49 1.40 134.5 10.00 6.33 1.37 138.1 9.75 6.17 1.34 141.6 9.50 6.01 1.31 146.8 9.25 5.85 1.28 151.2 9.00 5.69 1.25 156.0 8.75 5.53 1.22 160.8 8.50 5.37 1.19 165.6 8.25 5.21 1.16 170.4 8.00 5.05 1.13 176.4 7.75 4.90 1.10 182.4 7.50 4.74 1.07 188.7 7.25 4.59 1.04 195.1 7.00 4.43 1.01 203.7 6.75 4.27 0.98 212.3 6.50 4.12 0.95 220.9 6.25 3.96 0.92 230.0 6.00 3.81 0.89 243.7 5.75 3.66 0.86 257.4 5.50 3.49 0.83
